Input: We assume all input clips are trimmed to have \(N=17\)  frames following [1]}. During training, clips are randomly sampled from original videos which have any length. For videos that are shorter than 17 frames, we pad at both ends with duplicated starting and ending frames to form the clips. The validation and test set consist of fixed 17-frame clips. This simplified input setting allows us to split development into manageable pieces, and allows fair comparison with prior work. In practice, dense reconstruction on the entire video is achieved via a sliding window method.
